THE TONGUE, BY E. KLEIN. 517 



an inch beneath the surface, and receive at various points the 

 excretory ducts of the mucous glands. 



In the wall of these so-called crypts of the root of the 

 tongue, according to Kolliker,* closed follicles filled with lymph 

 corpuscles are imbedded. He describes each of these saccular 

 glands which receive at their base the excretory duct of an 

 acinous mucous gland, as consisting of a thick- walled capsule, 

 surrounded externally by a fibrous sheath, and lined internally 

 by a prolongation of the oral epithelium. Between these two, 

 and contained in a delicate, fibrous, vascular, and at the free 

 surface papillated matrix, lie a number of closed lymph follicles 

 of O'l to 0*25 of a millimeter in diameter, forming a continuous, 

 but for the most part single layer. 



Huxleyf has corroborated generally the correctness of the 

 description given by Kolliker of the glands at the root of the 

 tongue, but finds the crypts of the mucous membrane sur- 

 rounded, not by closed follicles, but by an indifferent cell con- 

 taining tissue, traversed by capillaries. Sappeyj has only 

 observed the acinous glands opening into the crypts, but not 

 the closed follicles; and whilst Sachs is very doubtful of the 

 presence of follicles in the wall of the sacculi, Franz Gauster 

 and Eckhard|| give their support in all respects to the state- 

 ments of Kolliker, 



GerlachlF states that he has found follicles in the wall of some 

 only of the lingual sacculi. 



The conclusions at which Arthur Bottcher ** arrived, have 

 quite a different tenor. He found 



* Beitrdge zur Anatomic der Mundhohle, Wurzburger Verhandlung, Band 

 ii., p. 177. 



t Huxley, " On the Ultimate Structure and Relations of the Malpighian 

 of the Spleen and Tonsillar Follicles," MicroscopicalJournal, Vol. ii.,p. 74. 



t Recherches sur la structure des Amy g dales et des glands situees sur la 

 base de la Langue, Comptes rendus, 1855, No. 22. 



Observationes de Linguce structura penitiori, Vratislav, 1856 ; and 

 Zur Anatomic der Zungcnbalgdrilsen und Mandeln, Reichert and Du Bois 

 Reymond's Archivf. Anat. u. Physiologic, 1859, p. 196. 



|| G. Eckhard, Zur Anatomic der Zungenbalgdriisen und Tonsitten, Vir- 

 chow's Archiv, Band xvii., p. 171. 



^ Handbuchder Gewebelehre, 1854, p. 297. 



** Arthur Bottcher, Einiges zur Verstandigung in Betreff der Balgdriisen 



